Adds Flash Fallback logging and clearcut logging (#3843)

packages/core/src/telemetry/loggers.ts

@@ -14,6 +14,7 @@ import {
   EVENT_CLI_CONFIG,
   EVENT_TOOL_CALL,
   EVENT_USER_PROMPT,
+  EVENT_FLASH_FALLBACK,
   SERVICE_NAME,
 } from './constants.js';
 import {
@@ -23,6 +24,7 @@ import {
   StartSessionEvent,
   ToolCallEvent,
   UserPromptEvent,
+  FlashFallbackEvent,
 } from './types.js';
 import {
   recordApiErrorMetrics,
@@ -156,6 +158,28 @@ export function logApiRequest(config: Config, event: ApiRequestEvent): void {
   logger.emit(logRecord);
 }
 
+export function logFlashFallback(
+  config: Config,
+  event: FlashFallbackEvent,
+): void {
+  ClearcutLogger.getInstance(config)?.logFlashFallbackEvent(event);
+  if (!isTelemetrySdkInitialized()) return;
+
+  const attributes: LogAttributes = {
+    ...getCommonAttributes(config),
+    ...event,
+    'event.name': EVENT_FLASH_FALLBACK,
+    'event.timestamp': new Date().toISOString(),
+  };
+
+  const logger = logs.getLogger(SERVICE_NAME);
+  const logRecord: LogRecord = {
+    body: `Switching to flash as Fallback.`,
+    attributes,
+  };
+  logger.emit(logRecord);
+}
+
 export function logApiError(config: Config, event: ApiErrorEvent): void {
   const uiEvent = {
     ...event,